Path: utzoo!attcan!uunet!munnari.oz.au!mimir!hugin!augean!sirius.ua.oz.au!nt!levels!ccdn
From: CCDN@levels.sait.edu.au (david newall)
Newsgroups: comp.unix.questions
Subject: Re: SYS V SIGCLD Handling
Message-ID: <2961@levels.sait.edu.au>
Date: 21 Nov 89 11:24:58 GMT
References: <957@sdrc.UUCP>
Organization: Sth Australian Inst of Technology
Lines: 30

In article <957@sdrc.UUCP>, scjones@sdrc.UUCP (Larry Jones) writes:
> #include <signal.h>
>
> handler()
>    {
>    signal(SIGCLD, handler);
>    }
>
> main()
>    {
>    signal(SIGCLD, handler);
>    if (fork() == 0) exit(0);
>    }
>
> When I run this on my Sys Vr3.0 system, it goes into recursive death.

A similar program which caught SIGINT, running under SVR1, gave me similar
results.  I don't understand why.  It seems to contradict the manual:

         "A call to signal cancels a pending signal sig except for a
          pending SIGKILL signal."


Could someone please explain this apparent contradiction?


David Newall                     Phone:  +61 8 343 3160
Unix Systems Programmer          Fax:    +61 8 349 6939
Academic Computing Service       E-mail: ccdn@levels.sait.oz.au
SA Institute of Technology       Post:   The Levels, South Australia, 5095